# -*- coding: utf-8 -*-
"""
    Sphinx test suite utilities
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~

    :copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import os
import sys
import tempfile
import shutil
import re
from functools import wraps

from six import StringIO

from sphinx import application
from sphinx.theming import Theme
from sphinx.ext.autodoc import AutoDirective

from path import path

from nose import tools, SkipTest

try:
    # Python >=3.3
    from unittest import mock
except ImportError:
    import mock


__all__ = [
    'test_root', 'test_roots', 'raises', 'raises_msg',
    'skip_if', 'skip_unless', 'skip_unless_importable', 'Struct',
    'ListOutput', 'TestApp', 'with_app', 'gen_with_app',
    'path', 'with_tempdir',
    'sprint', 'remove_unicode_literals',
    'mock',
]


test_root = path(__file__).parent.joinpath('root').abspath()
test_roots = path(__file__).parent.joinpath('roots').abspath()


def _excstr(exc):
    if type(exc) is tuple:
        return str(tuple(map(_excstr, exc)))
    return exc.__name__

def raises(exc, func, *args, **kwds):
    """
    Raise :exc:`AssertionError` if ``func(*args, **kwds)`` does not
    raise *exc*.
    """
    try:
        func(*args, **kwds)
    except exc:
        pass
    else:
        raise AssertionError('%s did not raise %s' %
                             (func.__name__, _excstr(exc)))

def raises_msg(exc, msg, func, *args, **kwds):
    """
    Raise :exc:`AssertionError` if ``func(*args, **kwds)`` does not
    raise *exc*, and check if the message contains *msg*.
    """
    try:
        func(*args, **kwds)
    except exc as err:
        assert msg in str(err), "\"%s\" not in \"%s\"" % (msg, err)
    else:
        raise AssertionError('%s did not raise %s' %
                             (func.__name__, _excstr(exc)))

def skip_if(condition, msg=None):
    """Decorator to skip test if condition is true."""
    def deco(test):
        @tools.make_decorator(test)
        def skipper(*args, **kwds):
            if condition:
                raise SkipTest(msg or 'conditional skip')
            return test(*args, **kwds)
        return skipper
    return deco

def skip_unless(condition, msg=None):
    """Decorator to skip test if condition is false."""
    return skip_if(not condition, msg)

def skip_unless_importable(module, msg=None):
    """Decorator to skip test if module is not importable."""
    try:
        __import__(module)
    except ImportError:
        return skip_if(True, msg)
    else:
        return skip_if(False, msg)


class Struct(object):
    def __init__(self, **kwds):
        self.__dict__.update(kwds)


class ListOutput(object):
    """
    File-like object that collects written text in a list.
    """
    def __init__(self, name):
        self.name = name
        self.content = []

    def reset(self):
        del self.content[:]

    def write(self, text):
        self.content.append(text)


class TestApp(application.Sphinx):
    """
    A subclass of :class:`Sphinx` that runs on the test root, with some
    better default values for the initialization parameters.
    """

    def __init__(self, srcdir=None, confdir=None, outdir=None, doctreedir=None,
                 buildername='html', confoverrides=None,
                 status=None, warning=None, freshenv=None,
                 warningiserror=None, tags=None,
                 confname='conf.py', cleanenv=False,
                 _copy_to_temp=False,
                 ):

        application.CONFIG_FILENAME = confname

        self.cleanup_trees = [test_root / 'generated']

        if srcdir is None:
            srcdir = test_root
        elif srcdir == '(empty)':
            tempdir = path(tempfile.mkdtemp())
            self.cleanup_trees.append(tempdir)
            temproot = tempdir / 'root'
            temproot.makedirs()
            (temproot / 'conf.py').write_text('')
            srcdir = temproot
        else:
            srcdir = path(srcdir)

        if _copy_to_temp:
            tempdir = path(tempfile.mkdtemp())
            self.cleanup_trees.append(tempdir)
            temproot = tempdir / srcdir.basename()
            srcdir.copytree(temproot)
            srcdir = temproot

        self.builddir = srcdir.joinpath('_build')
        if confdir is None:
            confdir = srcdir
        if outdir is None:
            outdir = srcdir.joinpath(self.builddir, buildername)
            if not outdir.isdir():
                outdir.makedirs()
            self.cleanup_trees.insert(0, outdir)
        if doctreedir is None:
            doctreedir = srcdir.joinpath(srcdir, self.builddir, 'doctrees')
            if not doctreedir.isdir():
                doctreedir.makedirs()
            if cleanenv:
                self.cleanup_trees.insert(0, doctreedir)
        if confoverrides is None:
            confoverrides = {}
        if status is None:
            status = StringIO()
        if warning is None:
            warning = ListOutput('stderr')
        if freshenv is None:
            freshenv = False
        if warningiserror is None:
            warningiserror = False

        application.Sphinx.__init__(self, srcdir, confdir, outdir, doctreedir,
                                    buildername, confoverrides, status, warning,
                                    freshenv, warningiserror, tags)

    def cleanup(self, doctrees=False):
        Theme.themes.clear()
        AutoDirective._registry.clear()
        for tree in self.cleanup_trees:
            shutil.rmtree(tree, True)

    def __repr__(self):
        return '<%s buildername=%r>' % (self.__class__.__name__, self.builder.name)


def with_app(*args, **kwargs):
    """
    Make a TestApp with args and kwargs, pass it to the test and clean up
    properly.
    """
    def generator(func):
        @wraps(func)
        def deco(*args2, **kwargs2):
            app = TestApp(*args, **kwargs)
            func(app, *args2, **kwargs2)
            # don't execute cleanup if test failed
            app.cleanup()
        return deco
    return generator


def gen_with_app(*args, **kwargs):
    """
    Decorate a test generator to pass a TestApp as the first argument to the
    test generator when it's executed.
    """
    def generator(func):
        @wraps(func)
        def deco(*args2, **kwargs2):
            app = TestApp(*args, **kwargs)
            for item in func(app, *args2, **kwargs2):
                yield item
            # don't execute cleanup if test failed
            app.cleanup()
        return deco
    return generator


def with_tempdir(func):
    def new_func(*args, **kwds):
        tempdir = path(tempfile.mkdtemp())
        func(tempdir, *args, **kwds)
        tempdir.rmtree()
    new_func.__name__ = func.__name__
    return new_func


def sprint(*args):
    sys.stderr.write(' '.join(map(str, args)) + '\n')

_unicode_literals_re = re.compile(r'u(".*?")|u(\'.*?\')')
def remove_unicode_literals(s):
    return _unicode_literals_re.sub(lambda x: x.group(1) or x.group(2), s)


def find_files(root, suffix=None):
    for dirpath, dirs, files in os.walk(root, followlinks=True):
        dirpath = path(dirpath)
        for f in [f for f in files if not suffix or f.endswith(suffix)]:
            fpath = dirpath / f
            yield os.path.relpath(fpath, root)
